A contractor in Casper hit a buried gravel lens at four feet during a foundation excavation last spring. The geotechnical report hadn't flagged it. That's the reality of building on the North Platte River terraces—stratigraphy changes fast. An exploratory test pit lets you see the soil profile with your own eyes before the backhoe ever arrives. In Casper's semi-arid climate, near-surface soils can mask deeper problems like caliche layers or uncompacted historic fill. The test pits we log follow ASTM D2487 for visual-manual classification. Disturbed samples go straight to the lab for index testing. We correlate pit observations with grain size analysis to confirm field classifications. For sites near the river or in older parts of town, a test pit reveals what the drill rig might miss.
A single well-logged test pit in Casper's terrace gravels can replace three borings when the stratigraphy is laterally continuous.
